The class is used by other sanctioning bodies with compatible rules, such as the International Conference of Sports Car Clubs.
The classifications within the Improved Touring group define cars that will run together competitively in a road race.
The rules from the GCR applying to Improved Touring cars mostly involve safety and basic setup.
These basic rules make Improved Touring a popular class, since familiar and modern cars race together in groups which maximize the chances for a close finish.
This section is not an exhaustive set of rules; it is intended to give the reader an idea of the preparation level of the cars in this class.
No internal engine modifications are allowed short of rebuilding to factory "blue print" specifications, though the car's ECU may be modified or replaced with an aftermarket unit.